Magnetic Memory Layout With Self-Aligned Pattern Sidewalls
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Solution Overview
Problem
Current magnetic memory devices face challenges in achieving high integration density and mass production efficiency due to complex manufacturing processes and alignment requirements for magnetic patterns and tunnel barrier lines.
Innovation Solution
The proposed magnetic memory device design includes conductive lines, magnetic lines, and magnetic patterns with specific sidewall alignments, where the magnetic patterns are self-aligned using shared mask patterns during etching processes, simplifying the manufacturing process and enabling higher integration density and mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If magnetic patterns and tunnel barrier lines are formed using separate mask patterns, then alignment precision can be controlled, but device complexity and manufacturing process complexity increase
Solution Approach 1:
The patent merges the formation of magnetic patterns and tunnel barrier lines into a single etching process using one shared mask pattern. This eliminates the need for separate mask patterns and multiple etching steps, thereby reducing manufacturing process complexity while maintaining alignment precision through the self-aligned nature of the single-step process.
Solution Approach 2:
The single mask pattern serves multiple functions: it defines both the magnetic patterns and the tunnel barrier lines simultaneously. This multi-functional approach reduces the number of manufacturing steps and simplifies the overall process while ensuring precise alignment between different structures.
2Manufacturing precision
If additional mask patterns are used for forming magnetic patterns, then manufacturing precision improves, but productivity decreases
Solution Approach 1:
The patent combines the formation of multiple structures (magnetic patterns and tunnel barrier lines) into a single etching step using one mask pattern. This reduces the total number of manufacturing steps, thereby improving productivity and manufacturing efficiency while maintaining precise alignment through the self-aligned process.
Solution Approach 2:
The single mask pattern is designed in advance to define both the magnetic patterns and tunnel barrier lines simultaneously. This preliminary design approach ensures that all necessary structures are formed in one step, eliminating the need for subsequent alignment operations and improving manufacturing efficiency.
3Ease of manufacture
If magnetic patterns are self-aligned using shared mask patterns, then ease of manufacture improves, but manufacturing precision requirements become more stringent
Solution Approach 1:
The magnetic patterns are self-aligned through the shared mask pattern, meaning the alignment is achieved automatically by the process geometry rather than requiring additional alignment operations. This self-aligning mechanism simplifies manufacturing while the precision is maintained through careful design of the mask pattern geometry and etching process parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies the manufacturing process, allowing for higher integration density and easier mass production of magnetic memory devices by eliminating the need for additional mask patterns and ensuring precise alignment of magnetic and tunnel barrier structures.
Implementation Method 1
magnetic memory devices using a movement phenomenon of a magnetic domain wall of a magnetic material
Data Source
AI summary
A magnetic memory device includes a conductive line extending in a first direction, a magnetic line extending in a second direction intersecting the first direction on the conductive line, the magnetic line intersecting the conductive line, and a magnetic pattern disposed between the conductive line and the magnetic line. The magnetic pattern has first sidewalls opposite to each other in the first direction, and second sidewalls opposite to each other in the second direction. The second sidewalls of the magnetic pattern are aligned with sidewalls of the conductive line, respectively.